Forums https://www.decware.com/cgi-bin/yabb22/YaBB.pl EQUIPMENT FORUMS >> ZMA >> ZMA Regulator Tubes https://www.decware.com/cgi-bin/yabb22/YaBB.pl?num=1557330988 Message started by HockessinKid on 05/08/19 at 16:56:28

Title: ZMA Regulator Tubes Post by HockessinKid on 05/08/19 at 16:56:28 Can one substitute OA3 regulator tubes on the ZMA? Any suggestions here based on experience, I'm curious about the OD3W tubes. HK

Title: Re: ZMA Regulator Tubes Post by Lon on 05/08/19 at 17:36:10 HK, doesn't look likely. According to the manual, there's no substitution for these tubes: https://www.decware.com/newsite/ZMAmanual.pdf Tube Substitutions STOCK Alternates KT66 KT77, KT88, 7027, 5881, EL34 6N23P 7DJ8, 6N1P, 6922, 6DJ8 OA3 None

Title: Re: ZMA Regulator Tubes Post by Carlsbad on 12/15/22 at 04:37:09 There is a russian equivalent that sounds very good, SG2S.  Also, Steve has condoned using OB3 which is a 90V regulator (OA3 is 75 V).  I admit I don't know exactly how this fits into the circuit.  I ahve tried several and went back to OA3.    Jerry

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